Editing Non-Buret Acid Base Titration Lab
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In this lab, we will <b>NOT</b> be using a Buret in measuring solution volume.<br> <br> Note: As you know, burets are the 2nd most precise/accurate volume measuring device with a Volumetric flask being the most precise/accurate instrument. Volumetric flask only records one volume whereas burets can measure various volume but can dispense solution one drop at a time.<br> <br> You will be using a Well plate as your reaction bucket. Also you will be using a pipette to dispense the acids and base. A separate pipette will be used to put one drop of the pH indicator (phenolphthalein) into each reaction well.<br> <br> Remember, we are using a pH indicator in order to know when to stop adding in the acid/base that will completely neutralize the acid/base. In order to do this, the Endpoint of the pH indicator needs to equal the Equivalence point of the solution. The equivalence point of the solution is when all the H<sup>1+</sup> ions have reacted with a OH<sup>1-</sup> ion to form H<sub>2</sub>O<sub>1</sub>. Since we are using strong acids and base, the equivalence point has a pH of 7.00. This is not true for all acid base titrations.<br> <br> Complete the following steps for each titration: <b>All solutions are 1.0M except for Vinegar, 20.drops = 1.0mL</b></br> <br> <u>Titrating a Strong acid (HCL solution) by a Strong Base (<nowiki>NaOH</nowiki> solution)</u><br> <br> 1. In one well, add 15 drops of HCL solution. (Record the number of drop and chemical formula in a data table)<br> 2. Add 1 drop of the phenolphthalein solution (via a pipette) to the acid solution (it may become cloudy, it is OK but not part of reaction)<br> 3. Place a toothpick into reaction well (it can not be removed from well)<br> 4. Start adding in the <nowiki>NaOH</nowiki> solution (via a pipette) one drop at a time with stirring (using toothpick) before adding another drop. Make sure that added solution does not hit toothpick before entering solution.<br> 5. Keep track of the number of drops until one drop makes the solution changes color and does not change back even after stirring (color becomes permeant).<br> 6. Record that number of drops and chemical formula in a data table.<br> <br> <u>Titrating a Strong base (<nowiki>NaOH</nowiki> solution) by a Strong Acid (HCl solution)</u><br> 7. Repeat Steps 1-6 just reversing the acid and base.<br> <br> <u>Titrating a Strong acid (H<sub>2</sub>SO<sub>4</sub>) by a Strong Base (<nowiki>NaOH</nowiki> solution)</u><br> 8. Repeat Steps 1-6 replacing HCl with H<sub>2</sub>SO<sub>4</sub> while leaving <nowiki>NaOH</nowiki> the same.<br> <u>Determining the Molarity of Acetic Acid in Vinegar. (Titrating a Weak Acid with a Strong Base).</u><br> 9. Repeat Steps 1-6 replacing HCl with H<sub>1</sub>C<sub>2</sub>H<sub>3</sub>O<sub>2</sub> while leaving <nowiki>NaOH</nowiki> the same.<br><br>
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